Malicious PDF — malware analysis report

Static analysis result for SHA-256 544384dbd5239158…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 04:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2faa6cb66458c96f94d1a061881b8425 SHA-1: 2330029ddb66fcdad9a7cafda1ace1ade488920b SHA-256: 544384dbd5239158a2cbbde74403da1fe783cea0e693d50f0937efa1e2ca4776
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis strongly suggest it's designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://jowinbio.com/upload/files/202108211218472397.pdf In PDF document text
    • https://igraonica.me/userfiles/file/gimax.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ded324054---murerofisa.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/kawebavikebutuxe.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa88611e91---73411104799.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/susefi.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/022872425c942b8d820f85c0a7d937df/subugijibevupojufere.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a647fda330bba6762b272c2efce60ccc/2484384183.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/xizal.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/38820040406.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/228371318.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/15977316527.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/pulupikoxovidomazenukuw.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/q162snudr3qdfe4qes0ghqqvp7/momifawivixuwetuxujazibof.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/vokabiremeveg.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/juwijokiwewefeku.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/t5d318bt9pj80rovrvn5eek4jo/97765105442.pdfIn PDF document text
    • https://allianztc.ro/files/file/28358282547.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/gebifiveni.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/femoxexarorozizezeminud.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b134d5d05---84782750826.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/sf3ik7rcra9k4u58ac3cj4pm0r/wizivuzi.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210830084800.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/kapevutulewixubotep.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/9a587f9fd6fa4bb49e7e33024f925c66/jovinidibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=thomas+lovell+beddoesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 10288 bytes
SHA-256: 0f26978bb3e7021d3bb9bfed0f2116c4efc556c7f0918aafa9f9cc4d3661b123
font_01_sfnt_off0001115c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 18316 bytes
SHA-256: f2f2ff52ef459a6f86ed0cc6c4e32d951f4cba118563103ac2a369d258b6eb51
font_02_sfnt_off00014083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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